Design and analyze of a highly compact directional coupler based on microwave planar circuit

Author

Faraji, Tayeb ; Nosrati, Mehdi ; Hazeri, Alireza ; Boochani, Sajad

Author_Institution

Dept. of Electr. Eng., Islamic Azad Univ., Kermanshah, Iran

fYear

2009

fDate

7-10 Dec. 2009

Firstpage

2602

Lastpage

2604

Abstract

In this article, an extremely miniaturized branch-line coupler (BLC) operating at 0.9 GHz is analyzed, designed and introduced to enhance the bandwidth accompanied by highly size reduction without via-holes, multilayered technique and air-bridged. A combination of a simple low-pass and band-stop filters is proposed to increase isolation between BLC´s ports. This model is equaled by a quarter wavelength line and necessary equations are obtained using even and odd modes analysis. A compact BLC is designed and analyzed using this technique. It is shown that the proposed BLC works as well as conventional ones though with size reduction of about 74% and 4.5% enhancement in bandwidth in analogy with recent branch-line coupler.

Keywords

band-stop filters; directional couplers; low-pass filters; microwave circuits; microwave filters; band-stop filters; branch-line coupler; frequency 0.9 GHz; highly compact directional coupler; low-pass filters; microwave planar circuit; Bandwidth; Capacitors; Costs; Directional couplers; Impedance; Low pass filters; Microwave circuits; Microwave theory and techniques; Transformers; Wideband; Branch - line coupler; odd and even mode analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2009. APMC 2009. Asia Pacific

Conference_Location

Singapore

Print_ISBN

978-1-4244-2801-4

Electronic_ISBN

978-1-4244-2802-1

Type

conf

DOI

10.1109/APMC.2009.5385242

Filename

5385242